Electromagnetic transmission-gear.



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E. L R A E A. H.

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ELECTBUMAGNETIC TRANSMISSION GEAR.

(Application led Ju. 16, 1902.)

(No lodol.)

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UNITED STATES PATENT OFFICE.

IIARDMAN A. EARLE, OF MANCHESTER, ENGLAND.

ELECTROMAGNETIC TRANSMISSION-GEAR.

SPECIFICATION formingpart of Letters Patent No. 711,300, dated October 14, 1902.

Application filed January 16, 1902. Serial No. 89,986. (No model.)

To a/ZZ w/wm/ it may concerns Be it known that I, HARDMAN ARTHUR EARLE, a citizen of England, residing at Salford Iron WVorks, Manchester, in the county of Lancaster, England, have invented certain new and useful Improvements in Electromagnetic Transmission Gear, (for which I have applied for a patent in Great Britain, dated October 12, 1901, No. 20,46%) of which the following is a specification.

My invention relates to the construction of electromagnetic transmission-gear in such a way that without any actual contact of the two members when one of them is energized by a current of electricity their mutual action thus produced causes the one member to follow and accompany the rotation of the other, the shafts on which the two members are fixed being thus clutched together and becoming unclutched on cessation of the energizing-current.

I shall describe an electromagnetic transmission-gear according to my invention, referring to the accompanying drawings.

Figure 1 is a longitudinal section, Fig. 2 is a transverse section, and Fig. 3 is a side elevation, of the transmission-gear.

As shown in Fig. 1, one of the members a of the transmission-gear is a hollow cylinder of iron or steel havingits one end open and its other end closed by a disk integral with the cylinder and made with a boss keyed onone, b, of the shafts to be clutched. A number of copper bolts c are passed through longitudinal holes bored in the cylindrical shell and have their ends riveted, preferably, over copper rings d. The rings d join up the rods 0, so as to form closed paths for the electric currents induced in them. It is the mutual action between these currents and those in the revolving electromagnet that causes power to be transmitted from one member of the gear to the other. The other member of the transmission-gear is keyed on the other shaft e, which is in line with the former, b, and this member is an electromagnet of such diameter thatit can revolve freely within the cylindrical member a without touchingits internal surface. tromagnet consists of a boss m, having an even number of radial pole projections n, every one or alternate one of which is wound with a coil of insulated wirep, making a number of poles ot' one polarity having between each pair of them a pole of opposite polarity, the ends of the wires being connected to two insulated rings t', fixed on and revolving with the member m.V This electromagnet, which constitutes one member of the transmissiongear, is keyed on one of the shafts c and is inserted into the hollow cylinder a, which constitutes the other member, the diameter of the ends of the poles of the one being somewhat less than that of the interior of the cylinder, so that the two members do not touch each other.

By conducting-brushes bearing on the two insulated rings t' a direct continuous electrical current from a source of electricity can be transmitted through the coils p, energizing the magnet-poles, so that when one of the members of the transmission-gear rotates the other is caused to rotate with it.

Having thus described the nature of this invention and the best meansI know of carrying the same into practical effect, I claim- An electromagnetic transmission-gear consisting of two members fixed respectively on two shafts in alinement, the one member being a shell of iron or steel traversed by copper bolts secured to copper end rings, the other member consisting of an electromagnet having pole-pieces extending nearly to but not contacting with the interior of the shell; substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

IIARDMAN A. EARLE.

Witnesses:

P. A. RAMAGE, Rohr. Davis.

This elec- 

